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Originally Posted by KenWittlief
Which is another argument for a lifeless galaxy/universe. The galaxy is 16 billion years old. If it only take 2 million years (0.0125%) to colonize the galaxy then, where are they? Where are the other colonies and why are we not in contact with them? Every inhabitable planet in the galaxy should be colonized by now.
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Well, I'd assume there's only a few inhabitable planets. Therefore, there's only a few other colonies. I feel safe saying that some of them would have destroyed themselves by now - look how close we are... The remaining ones may have forgotten we're here.
Another likely scenario is something out of Stargate. Some advanced civilization wanted slaves, so they grabbed humans (or maybe other humans took human slaves). With their development stunted, most of the colonies aren't capable of interplanetary travel/communication. They don't necessarily have to be slaves either. Maybe some crackpot or a facist government was running an experiment...or trying to get rid of people...